Example: According to an interview with K.A. West (personal communication, August 3, 2016)...

or According to an email from K.A. West (personal communication, August 3, 2016)...

APA citation style has the following to say about citing personal communication (section 3.102): "Personal communications may be letters, memos, some electronic communications, telephone conversations, and the like. Because they do not provide recoverable data, personal communications are not included on the References page.

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